You can run it directly from a USB drive or a dedicated "Emulation" folder without leaving registry traces.
The file is a specific development build of the Citra 3DS emulator , compiled and hosted by EmuCR (Emulator Configuration & Resources) . EmuCR-citra-windows-20221124-d117132.7z
By late 2022, Citra had reached a high state of maturity. This build features: You can run it directly from a USB